Stop-motion for sewing-machines.



N0. 894,073. PATENTBD JULY 21,1908.

SLATER 55 J. T. HOGAN.

STOP MOTION POR SEWING MACHINES.

APBLIOATION FILED AUG.23,1907.

3 SHEETS-SHEET l.

H. W. SLATER a J. T4 HOGAN.

STOP MOTION FOR SEWING APPLICATION FILFA 3 SHEETS-SHBET 2.

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No. 894,073. Y EATENTED JULY 2l, 1908. H. W. SLATER & J. T. HOGAN. STOP MOTON FOR SEWING MACHINES.

APPLICATION FILED AUG. 23, 1007.

s SHEETS-Smm a.

' driving mechanism understood, we

in detail an embodiment thereof with refer- 5.

panying drawings,

tation of' the drive shaf UNITEDV STATESy PATENT,A OEE-ron.

'Hansis w. SLATEE, or LAKE MAHoPAo, NEw YORK, AND JAMES T; HOGAN, or JERSEY orrr NEW iERSEY, AS'sIGNoRS To THE NAroNAL MA YoRmaooRPoRATION or NEW YORK.

HVINE COMPANY, OF MAMjlRONECK,

s'ror-xorron Fon SEWING-Macfarlane.

Specification of Letters Patent.

'Patented my 21,4 190e.--

Application led August 23, 1907. Sei-ia! No. 889,767.

a citizen of the United States of America, and

a resident of Lake Maho ac, county of Putnam, and State of New iiork, and JAMES T. HOGAN, a citizen of the United States of America, anda -resident of Jersey City, county of Hudson, and State of N ew. Jersey, have mvented certain new and useful Imrovements in Stop Motions for Sewingachines, of which the following is a specication, reference being had to the accomforrning a part thereof. `Our Invention relates to improvements in stop motions for sewing machines and particularly to stop motions for machines'adapted to sew a group of stitches, such as in the formation of button-holes. T e main objects of our invention are to simplify, improve, and strengthen mechanism of this description, such as will bring the quickly to a standstill .momentum in such a way as to lessen as much as possible the shook on the parts and to positively bring such driving mechanism to a stop at a predetermined position with respect to the rot. v To thisend we have devised a mechanism in which aswinging'frame is provided with two spring-pressed plun ers, one to act as a momentum absorber an in addition to prevent re-coil, and the other to act as a positive limiting stop. The drive shaft is provided while absorbing the With-a cam for cooperating with the first' having a gradual insaid plunger, said ca xiii rotation of the shaft oline in the direction ,and an abrupt shoulderin the opposite direction, and with a ing the other said lunger after the said cam and the first-said p ungeifliave. cooperated.

In order that our inyeition may be fully Will now proceed to describe projection for engagenceV to thevaccompanying trating the same,'.-and,wil the novel'features in claims.

In the drawings: Figure 1 'is a view in sideelevation of such parts of a sewing machineas is necessary to illustrate our invention, 'showing particularly embodying the invention.- Fig. 2 is an end view thereof; Fig. 3 is a view in horizontal drawings -illusthen point out section through therear portion of the sew'- ing machine showing the stopmotion in' top view. Fig. 4 is a view inside elevation of the rear portion of the machine showing the stop motion 1n a dier'ent position -to that in which it is shown inFig. 1. Flg. 5 is adetail transverse sectional view upon the line 5 of Fig. 4 -showin articularly the cam and projection carrie Ihy the 'drive shaft. Fig. 6 is a detail view of a portion of the tripping deviceemployed, the same being shown 1n horizontal line 6 6 of Fig. 4.

The machine herein illustrated comprises the usual bed 10 and overhanving arm 11. The drive shaft 12 is journaled in the said overhan ing arm 11, said drive shaft being rovider Wlth the usual fast and loose puleys 13-and 14 respectively. A swinging the said drive Shaft 12, the axis of the said pivot 16 being transverse with res ect to the axis of rotation of the shaft 12, whereby the said frame will swing in a path longitudinally inline with the axis of the shaft 12, as will be well understood. A spring-pressed plunger 17 .is mounted to move longitudinally in said swinging frame toward and away from the shaft 12, said plunger being spring-pressedv toward the said shaft bymeans of a spring 18. TensionV upon the spring 18 may be regulated by means of a set screw 19. The drive shaft 12 is provided with a cam 20 which is mounted fast thereon, said cam having a gradual inoline portion 21 in the direction of rotation of the said shaft, and a substantially ablpt shoulder 22 in the other direction. The cam and plunger 17 are arranged to be inline with each other and to coperatie when the swin ing frame has moved to the position in whic 1 it is shown in Fig. 1, but when the said frame is moved into the position in which it g is shown in Fig. 4 the said'cam and as-will be understood byjreerence to the drawings. The swinging frameE 15 carries another springpressed. plunger? said; plunger, in the present instance, bein shownA fionV yns mounted to movex longitudinal y in a direction transverse withv respect to .the direction of movement of the first/#said plnn',`fv ;e1"L

a stop motionv I u tion lijrneansp'fhu ddlor 17. The plungerZEis pressed, in onedireo- ,nearest-threaded sion of the spring. This plunger 23 is provided with a shouldered portion 25 which is arranged to be in the path of movement ota projection 26, carried by a shaft 12, when the When the swinging frame is moved to the position in which it is shown in Fig. 1 the cam 2O will engage the plunger 17, gradually depressing the saine, whereby the momentum of the s aft 12 and parts carried thereby will be gradually absorbed. Finally the said plunger will pass over the projecting portion 21 of the cam and will drop in behind the shoulder 22. At about this moment the projec tion 26 will engage the shouldered portion 25 of the plunger 23 to positively prevent the shaft from moving any further, eXoe t within the slight limits allowed by the yie ding of the spring 24. Should the spring 24 yield at all it will thereafter immediately return the plunger 23 to its normal position, and the shouldered portion 22 of the cam 20 will then act as a means to prevent recoil of the parts, the shaft being substantially held in a positive predetermined position by the two said plungers, one actin g to prevent movement in one direction and the other to prevent movement in the. opposite direction. Such a construr tion and arrangement ofparts not only tends to bring the driving mechanism to rest quietly and without shock to the parts, but as will be readily realized, brings the parts always to rest at a particular predetermined point. Theswinging frame is normally held in position in which it is held in Fig. 4, where- 'in the two said plungers will be 4out oll the pathof inoven'ient of the cani 2() and projection 26, and tripping mechanism is provided for moving the frame 15 to the position in which it is. shown in Fig. 1 when it is desired to stop'the machine. rllie holding means and -tripping mechanism comprises a spring 27 which surrounds, and vexerts a constant upward pressure upon, a stud 2S, said stud being pivotally connected at 29 to an arm 3() securedto the said swinging frame 15. The stud 28 .is provided with a collar 31 which is normally engaged by a tripping lever '32 )ivoted at 33 to the-bed ofthe machine. i' ien the device is to be operated the tripping lever is swung upon its pivot to ,clear the collar 31 The spring27 will then operate to throw the swinging framr` into its operati vc position (as sho'lwn in Fig. 1), and the said frame will reniain in suoli position. until it is re-set by being moved baci: against tlie resistance of the spring 27 t-o the position in which it is shown in Fig. 4, such re-setting being accom-- plished manually or otherwise, as may be desired.

The swinging traine is provided with a belt shipper 34 whereby at ythe moment it is dropped it `will throw the drivin(T belt from the fast pulley 13 to the loose pulley 14, and similarly, when the frame is re-set, will carry the belt back again from the loose pulley 14 to the tast pulley 13. i..

What weciaiin is:

1. ln a sewing machine, the combination with a swinging frame j and two spring pressed plungers mounted therein and carried thereby, one oi said plungers constituting a momentum absorber and re-coil preventer, and the other, a positive stop, but one which will yield within certain limits, of

a drive shaft, a cam mounted thereon for'engagement with the iirst said plunger, a projection carried by said shaft tor engagement with thesecond said plunger, means for moving the swinging frame to bring the said plungers into and out ol line with the said cain and projection, and means carried by the said frame for disconnecting said shaft from its driving mechanism.

2. In a sewing machine, the combination with a drive shalt and a cam mounted thereon, ol a swinging frame adapted to move in a path longitudinal with respect to the axis of said shaft, a spring plunger carried by said frame, said plunger arranged to move longitudinally in said l'raine in a direction toward and away from said shaft, a second spring plunger carried by said frame and arranged to move longitudinally therein in a path transverse with respect to the 4lirst said plunger, a projection carried by said shaft arranged at certain tiniesto 'engage the second said plunger, means for normally holding said l'rame in a position whereby the lirst said plunger will be clear oi' the cani and the second said plunger will be clear ofthe said projection, and means for tripping the said frame to bring the lirst said plunger in line with the said cani and the second said plunger in line with the said stop.

52 ln a sewing machine, the combination with` a drive shaft and a cam mounted thereon, of a swinging frame pivoted to move in a path parallel with the axis of rotation of said shal'jt, a spring-pressed plunger carried by the said trame, said plunger adapted to be moved into' line with said cani when the frame is swung in one direction, said cam and plunger arranged to cooperate at such times for the purpose ol' absorbing the momentum of the shaft but not l'orbringing the shaft to prevent other than slight further movement of the shaft after said cam and lirst named plunver have cooperated, and means for movlng t e said frame whereby to bring the said rst named plunger into and out of line with the said cam.

4. In a sewinor machine, the combination with a drive shait and a cam mounted Athereon, said cam having a gradual incline in the direction of movement of the shaft, and an abrupt shoulder in the opposite direction, or'I a swin ing frame ivotally mounted ad'aoent to sai drive sha t, the pivotal axis t ereof i being transverse with respect to the axis of said drive shaft, a spring-pressed plunger carried by said frame arranged, when the frame is moved in one direction, to cooperate with the said cam and to be moved longitudinally whereby to absorb the momentum of and arranged to cooperate with said projection when the frame is moved to a position wherein the rst said plunger is in line with the cam, said shaft being prevented from further movement in a forward direction by the engagement of said stop with said projection and from return movement by the engagement of said first named plunger with the shouldered portion of said cam, and means for swin ing the frame upon its pivots to carry the p ungers into` and out ofline with the said cam and projection.

HARRIS W. SLATER. JAMES T. HOGAN. Witnesses:

ELLIOT C. HOUSE, JOHN J. SHAW. 

